Research-level Rosand RH7 and RH10 capillary rheometers provide highly flexible measurement capabilities for materials under high pressure and high shear rate extrusion - from polymer melts to ceramics, and from foodstuffs to inks and coatings.

  • High force range (up to 100kN) and wide dynamic speed range (>225,000:1) allow test correlation with real material processing conditions.
  • Twin bore barrels as standard enable absolute shear viscosity measurements and simultaneous calculation of extensional (elongational) viscosity.
  • Range of optional barrel sizes and barrel materials to permit measurement of thermally-sensitive, chemically-aggressive or aqueous-based samples.
  • Wide range of high precision tungsten carbide dies as standard to cover all materials and test types.
  • Easily interchangeable melt pressure transducers to cover all test requirements – configured with low noise, triple-stage amplifiers for optimized measurement sensitivity at the die entry when using ‘zero length’ dies (extensional viscosity measurements).
  • Nitrogen purge option available for testing in a dry, inert atmosphere to minimize sample degradation.
  • Integral fume chamber with extraction to vent sample gases for operator safety.
  • Proprietary bi-modal speed control algorithms suited to low and high speed operation optimize shear rate measurement range for a particular die.
  • Precise sample temperature control using three independent zone heaters, with 10 times DIN accuracy platinum resistance thermometers. High temperature (500ºC maximum) and cooling coil options also available.
  • Rigid ‘H’ frame design for compliance-free measurements in transient tests such as pVT determination.
  • Open design below barrel exit to accommodate optional accessories such as die swell measurements, melt cutters, slot die system and melt strength (Haul Off).
  • Easy to use Flowmaster software with full range of tests and analyses for shear and extensional viscosity, as well as determining sample stability, wall slip and melt fracture.

The Rosand RH7 and RH10 capillary rheometer systems enable controlled extrusion (by volumetric flow) of a sample through a high precision die of known dimensions, to characterize material flow properties typically under conditions of high force (or pressure) and/or high shear rate. Using a twin bore barrel and a ‘zero length’ die configuration allows simultaneous determination of shear viscosity and extensional (elongational) viscosity as a function of shear (or deformation) rate.

A capillary rheometer system comprises several key components to enable robust, reliable and accessible rheological measurements for a particular sample or application:

  • Capillary rheometer base unit. Includes the barrel with bores to load the sample – the bore diameter and barrel material must be compatible with the material(s) under test. The base unit also includes a head unit, which has a mechanical connection to the pistons which are used to extrude the sample. Key system functions of drive force and piston speed range are controlled by the base unit.
  • Die and pressure transducer combination. The die is mounted at the bottom of the barrel bore, and its dimensions define the applied shear field. A melt pressure transducer is mounted in the barrel to measure the resultant pressure at the die entrance as the material is extruded. The die dimensions and pressure transducer range must be appropriate to the sample type and test under consideration.
  • Temperature and/or environmental control options. Accurate control of barrel temperature is essential since rheological properties are a strong function of temperature. For thermally-sensitive materials, thermal equilibrium times and inert test environments are critical considerations to ensure reliable data.
  • Instrument software. Rheological testing can be, by its nature, relatively complex to set up. The Rosand Flowmaster software interface is designed for simplicity and ease-of use with intuitive test set-up methodology in conjunction with a ‘live’ instrument graphic at run time reporting all key test and measurement parameters.

If you are unsure as to specifying an appropriate rheometer model for your application, Malvern recommend contacting us for further advice and/or a sample test and evaluation report. Understanding the application under consideration, and the associated rheological test requirements, is a key factor in selecting the most appropriate rheometer system.

General

Dimensions (W, D, H):
700mm, 580mm, 2450mm (without accessories).
Maximum drive force:
50kN (RH7); 100kN (RH10).
Frame stiffness:
250kN.
Maximum speed:
600mm/min (RH7); 1200mm/min (RH10).
Dynamic range in speed:
240,000:1.
Speed uncertainty:
<0.1%
Temperature range:
Ambient to 400ºC (standard). Ambient to 500ºC (high temperature option). 5ºC to 200ºC (low temperature cooling coil option).
Temperature control range:
<±0.1°C.
Bore diameter:
15mm (standard). 9.5mm; 12mm; 19mm; 24mm (bore options).
Barrel bore length:
290mm.
Barrel material:
Nitrided steel (standard). Hastelloy; Stainless Steel (barrel options).
Pressure transducer ranges:
30,000psi; 20,000psi; 10,000psi; 5,000psi; 1,500psi; 500psi.
Dies:
Tungsten carbide: precision ±5µm.
Die diameter:
0.5mm to 2mm (in 0.5mm increments) and 3mm as standard. (Other diameters, including fine bore dies, available to special order)
Atmospheric control:
Nitrogen purge for dry, inert test conditions (option).

Weight and dimensions

Dimensions (W, D, H):
700mm, 580mm, 2450mm (without accessories)
Weight:
350kg (without accessories)

Operating environment

Power:
Three phase 220V/ Three phase and Neutral 415V 16A
Temperature:
15°C – 40°C.
Humidity:
35% - 80% non-condensing.

The Rosand range of capillary rheometers can be configured with a variety of measurement accessories to cover a range of application requirements.

Rosand RH7/10

Dies

Wide range as standard for all material and test types.

Interchangeable capillary dies for Rosand rheometers define the applied shear field and deformation regime when a material is extruded through them.

More information

pVT (Pressure, Volume and Temperature) measurement

Enables assessment of material compressibility.

The relationship between a material’s pressure, volume and temperature is important for polymer processing, and injection molding in particular, to enable optimized cycle times whilst maintaining a finished product of sufficient quality.

More information

Slot Die for Rosand capillary rheometers

Enables direct measurement of true shear stress.

Accessory die with rectangular cross section (also termed slit die) and ports for three flush-mounted pressure transducers along its length, to remove the need for Bagley correction for entrance pressure drop, and enable true shear viscosity measurement.

More information

Die and Melt Cutters

Prevents extrudate elongation for die swell measurements.

Provides controlled cutting of the melt extrudate below the die exit to ensure accurate die swell measurements by preventing gravitational extension.

More information

Die swell

Sample elasticity from direct measurement of extrudate diameter.

Die swell, or extrudate swell, is a common phenomenon in polymer processing, and is related to elastic recovery of the melt following extrusion through a die.

More information

Haul off accessories for Rosand capillary rheometers

Melt tension measurements as a function of haul off speed.

For many polymer production processes, such as fiber forming and blow molding, melt strength is a critical parameter for both process control and product quality.

More information

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